str1 = '欢乐逛欢迎您'
print(str1[::-1])

for num in range(0, 11):  # 输出整除0到10
    print(num)


str = 'a,hello'
print(str.find("hello"))   # 存在，返回下标2
print(str.index("hello"))  # 存在，返回下标2

str2 = 'a,b,c,d'
list = []
list_str2 = (''.join(str2))
list.append(list_str2)
print(list)


str3 = '笔试题123A'
print(str3.replace('123', '进行中'))
